Midea MCH2U-18PHH2 Service Manual page 29

PCB board of MCH4U-36PHH2
connect to the 4-WAY
when 4-way is ON, output 208-230VAC
connect to compressor heater
when heater is ON, output 208-230V AC
Connect to the Indoor evap.pipe
out temp. sensor
T2B-A、T2B-B、T2B-C、T2B-D、T2B-E
Electric Expansion
Electric Expansion
Value E
Value D
connect to exhaust
temp. sensor
E D
CN19 CN18
C C64
CN42
E1 IC7
CN43-4/CN37 CONNECT TO
AC FAN MOTOR(LOW SPEED)
[1.4]2014.06.26
CN43-3/CN36
FAN-L
AC fan motor low speed
CN3
connector CN37
RY7
CN43-2/CN35
AV fan motor N phase
CN43-5,CN43-1/CN41,CN42
AC fan motor capacitor
connector
CN22 L RY5
CN43
FAN
CN3 N
CN44 L
electric RY2
CN10 N
heater1
CN40 L
electric
CN4 N
heater 2
Fuse 5A/250V
5A/2 50V
T3 FUSE2
CN8
pipe temp sensor E9
D13 R33
(3.3V)
IC5
(3.3V) connect to
D14
room temp sensor E8
R35
trmp. sensor
T4
IC22
R26 D11 R28
high pressure sensor connect to high and low
pressure sensor R30 D12 R31
low pressure sensor
E3
C98
CONNECT TO INVERTER driver
R51
E2
Q5
R52
CN5
N-OUT
D2
208-230V AC
connect to the terminal
CN6
L-OUT
RY4
PTC1
CN23 reserve
6 5 4 3 2 1
Electric Expansion
Electric Expansion 485 testPort
Electric Expansion
Value C
Value B communication connect to detector
Value A
C
B A
CN20 Q P
CN17 CN21
E
R60
C72 C65
R54 R53 C23
C67
IC8 D4
IC6 R38 R39 D1
CN12
FAN_OUT
C6 IC21
R74
R117
R114
D24
R113
IC10
C25
R1 IC20 C53
C54
RY6
IC9 IC18
R2 R132 R111
Q9
Q8 R108
D25
T2B-E T2B-C T2B-D T2B-B T2B-A R106
C45 C48 C47
SSR1 IC19
R119
IC16
CN13
Q7 R105
D26
R104
R120
+ + E12 R102
+ + + C42
E19 IC17
C40
E16 E15 E14 C43
IC14
C70
R99
D17
Q6
R96
TP
D27
R73 R98
C37
IC15
E13 C38 C35
Q3 IC12
RY3
R93
R70
R71 D23 E4
R63 C93 C8 R90
D28
C92 R67 R135 R92
C56 C95
RY8 C30
IC13
C33 C32
IC4
E20 C52
C97 E21
C20
R118
C26
C44
R109 IC2
R103 C41
R213
C36
R55
C28
R59 X1 N-IN
C66 R56
C5
R43
R41
C68
C17 CN2
R40 R47
R211
R49
R210
IC30
E11
ZR2
D3 CONdebug
C69 C18 D22
SW1
R58
C4
IC3
ZR1
R36 D5
Q1
L2 C2
E5 DSP1
R22
R21
R11
CN23 R12
R13
R14
R10 Q2
SHOW/SW
L3 R20 Q4
L1
ZR4
C59
C16
C10
D30
CN32
CN38
D29
C61
C60
C11
202302141206
EU-KFR105W/BP3T5N1-350S.D.13.WP1-1
29
external drive DC fan
motor connector
external drive DC fan
external drive DC fan
motor ouput terminal
motor input terminal
FAN_IN
CN11
D10
CN30 current loop
S-A
communication A
D9
CN29 current loop
S-B
communication B Signal wire
connect to the terminal
N L
current loop 24VDC Pulse wave
S
communication C
D8
CN28
current loop
S-C
communication C
D7
CN27
S-D
current loop
communication D
D6
CN26
S-E current loop
communication E
power supply
208-230V AC
C55
connect to the terminal
C57
C90
CN1
L-IN
EARTH
P-1
DSA1
connect to earth
ZR3
Fuse
T30A/250V
C3
test report
connect to detector
C1
digital display button
digital display